Thanks for this question/suggestion. I regret that there is no MLA or WordPress option you can access to change the icon size.
You can always click the icon or use the Edit rollover action to get to the Media/Edit Media screen, which shows a much larger version of the image, but I know you have a strong preference for using the Quick Edit area to make these changes.
By making changes to the MLA CSS style sheet I was able to increase the icon size to 128/128. If you want to modify the /wp-content/plugins/media-library-assistant/css/mla-style.css file, look for:
/*
* MLA List Table ID_parent column
*/
img.mla_media_thumbnail_64_64 {
max-width: 64px;
max-height: 64px;
}
and replace it with:
/*
* MLA List Table icon column
*/
#icon.column-icon {
width: 128px;
max-width: 128px;
height: 128px;
max-height: 128px;
}
/*
* MLA List Table icon column
*/
img.mla_media_thumbnail_64_64 {
width: 128px;
max-width: 128px;
height: 128px;
max-height: 128px;
}
You can use 128 or any dimensions you want to get a comfortable size.
If you make these modifications, remember they will have to be re-applied when a new MLA version comes out. I will consider an enhancement to adjust the size with an options setting in a future release.
I am going to mark this issue resolved, but please let me know if you have any problems with the suggested fix or any further questions.